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一、课文背景知识
在社会发展进程中，农业经历了原始农业 primitive agriculture 、传统农业 traditional agriculture 和现代农业 modern agriculture 三个发展阶段。
19世纪40年代到20世纪初，是全世界传统农业向现代农业的过渡时期;而从20世纪初期到50年代，是现代农业的确立时期。
现代农业有四个重大特点：一是生物科学的发展和杂交优势理论的应用使人类能够通过育种手段，选择和要培育出品类繁多、高产优质的农作物和禽新品种，摆脱了对天然品种的依赖。二是化学肥料和农药的发明和生产，建立了农用化学工业，提供了农作物所需养分和减轻了病虫草的危害。三是蒸气机的发明，促进了机械化和半机械化农具的广泛应用，以现代工业技术和设备武装农业，实行区域布局、专业化生产，集约化经营，显著提高劳动生产率和土地利用率。四是这四大类技术的交织和综合，为农业生产开创了一个新纪元，使农作物和蓄禽产品大幅度增长。
大约在200年间，农民基本上采用传统耕耘方式，农作物产量很低，差不多每100个农民一年的辛勤劳作进能养活两个居民;现在一个高效率的农民一年劳作可以生产6万~10万千克粮食，3000~4000千克肉食，足可以养活200~300个居民。过去一个农民生产100千克粮食需要1-2天的劳动，而现在只需要几秒钟就足够了。
现代农业的核心是科学化，特征是商品化，方向是集约化，目标是产业化。
现代农业是与生态农业 eco-agriculture ，旅游观光农业 sight-seeing agriculture ，绿色食品green food ，无公害蔬菜 healthy vegetables ，以及可持续发展 sustainable development 息息相关的。
二、疑难解析
1. It is on this arable land that the famers produce food for the whole population of China.
农民们正是在这些可耕地上为全国人民生产各种粮食。
[问]如何理解这个句子结构?
[答]这是个强调句，，其结构为：It is was+被强调部分+that/who-从句，被强调部分可以是句子的主语、宾语、状语等，如果被强调部分是物，从句用that引导，如果指人，则可用that或who来引导从句。课文第三段还有一个强调句。又如：
It was they who thathelped me in the street this morning. 今天上午就是他们在街上帮了我。
It was this morning that they helped me in the street. 他们是今天上午在街上帮我的。
Who was it that taught them French yesterday? 昨天教他们法语的是谁?
What was it that the new teacher taught them yesterday? 昨天新老师教他们的是 什么?
2. To make as much use of the land as possible. two or more crops are planted each year where possible. 为了更充分地利用土地资源，在可能种植两种或两种以上作物的地方种植不同的作物。
[问]不定式短语为什么放在句首?怎样理解as possible 和where possible?
[答]不定式作目的状语可位于句首，起强调作用，此外i norder to 和so as to 都可引导目的状语，但so as to 不能位于句首。如：
In order to pass the exams, he did his lessons till late at night.
为了通过考试，他复习功课直到深夜。
此句可改为：He did his lessons till late at night so as to pass the exam. 句中的make use of 是一个短语，意为：“利用、使用”，如：
We should make full use of time in our study. 我们在学习中应充分利用时间。
It is very important for us to make good use of water. 好好利用水资源是很重要的。
句中的as much ... as possible 意为：“尽可能多地……”， much 后接不可数名词，若为可数名词，则用many来修饰。又如：
Please give him as muvh help as possible. 请尽可能多地买了书。
句中的where possible 是一种省略形式，在句中作地点状语，相当于where it is possible ，连词if，when， while， until等都可用于这种省略句。例如：
I will pay you a visit when I amfree. 我有空时会来看你的。
Tell the manager immediately about it if it is necessary. 如有必要，迅速把这事儿告诉经理。
3. This saves time and allows famers to grow an extra crop in each season. 这就节约了时间允许农民可以在每个季节里种植一种额外的作物。
[问]allow 和let的含义和用法有什么不同?
[答]二者均可作“允许”解，但各有侧重;allow重在“允许”或“容许”，也可表示客气的请求，常用于allow sb. to do sth. 或allow doing sth. 结构中。例如：
He allowed me to take his dictionary. 他允许我拿走他的词典。
Will you allow me to use your bike?我可以用你的自行车吗?
We don't allow smoking here. 我们不允许在这儿抽烟。
而let作“允许”或“让”解，主要用于口语，一般可与allow互换。作“允许”解时，常暗含“听任”“默许”之意。注意： let之后作宾补的不定式不带to， 且不可用于被动语态，而allow则相反。例如;
Please let me walk with you =Please allow me to walk with you. 我请允许我跟你一起走。
4. It is from the early 1990s that scientists started to develop new techniques to increase agricultural production without harming the environment. 科学家开始发展研究既提高农业产量又不破坏环境的新技术是在二十世纪九十年代。
[问]该句中develop是什么意思?介词without有什么用途?
[答]develop 意为：发展，发达，发扬，发育，进步，逐步生长，逐步显示出来”等。如：
Plants develop from seeds. 植物由种子发育而成。
Several industries are developing in this area. 几种工业正在这个地区发展。
Some children develop more slowly than others. 有的儿童比其他的儿童发育得慢。
Fresh air and exercise develop healthy bodies. 新鲜空气和运动能使身体健康。
He developed the photo graphs which he had taken. 他冲洗了他拍摄的胶卷。
developing 意为：“发展中的”， developed意为“发达的”，如：
China is a developin country while Japan is a developed one. 中国是个发展中的国家， 而日本是个发达的国家。
介词without 表示“不，没有”， 后接名词、代词或-ing形式，在句中用做状语、表语或定语，如：
She day passed without seeing me. 她从我身边走过而没有看见我。
They never meet withour quarreling. 他们一见面就要吵嘴。
Future agriculture should depend on high technology as well as traditonal methods. 未来的农业将依靠高科技和传统的方法。
[问]as well 和as well as有什么不同?
as well意为： “还;也”， 相当于too， 通常位于句末。 如：
He gave me advice, and money as well. 他给我忠告，也给我钱。
She went there as well. 她也去了那儿。
as well as 与as well 同意，但常用来连接两个并列成分，可译为：“除……之外;和”。强调的重点在第一个成分。 如果连接的两个并了成分作主语，谓语动词的数和第一个成分一致。 如：
He gave me money as well as advice. 她除了给我忠告外，还给我钱。
You as well as I are right. 我是对的，你也是对的。
5. Not only food production is important but also taking care of the environment. 不仅食物生产很重要，保护好环境也同样重要。
[问]怎样理解这个句子结构?
[答]此句相当于：Not only food production but also taking care of the environment is important. 并列连词not only ...but also...意为：“不仅……，而且……”，连接两个并列的主语food production 和taking care of the environment.
not only... but also ...也可连接两个并列的谓语、宾语、表语、状语等，还可连接两个并列的句子，所强调的重点是后面的一个。有时可省略also。又如：
She not only sings well but alsodances beautifully. 她不但歌唱得好，而且舞也跳得很优美。
He was not only a successful writer but alsothe greatest poet of his time.他不但是一位成功的作家，而且 他啊那个时代最伟大的诗人。
He is famous not only in China but in the whole world. 他不仅誉满中国，而且誉满全世界。
当not only ...but also...连接两个主语时，谓语动词应采取“就近一致”的原则，与后面哪个主语保持人称和数的一致。如：
Not only the students but also the teacher is pleased. 不仅同学们高兴，老师也高兴。
Not only he but also you are going there. 不仅他，而且你也要去那儿。
【同步练习题】
1.The biggest problem of Chinese farmers is _____.
A.the shortage of arable land B.lack of labor force
C.lack of technology D.lack of money
【答案】 A
2.Scientists have started to develop new technology to increase agricultural production without harming the environment since _____.
A.the 19th century B.modern times
C.the early 1990s D.the 1980s
【答案】 C
3.New techniques are those which can _____.
A.increase agricultural production
B.protect the environment from being harmed
C.bring in great profit
D.not only increase agriculture production but also be friendly to the environment
【答案】 D
4.Which of the following is true according to the passage?
A.Jia Sixie was the earliest agricultural scientist.
B.The knowledge in Qi Min Yao Shu is not useful for farmers today.
C.Jia Sixie's book is a practical guide to farming.
D.Jia Sixie's book deals with only farming.
【答案】 C
5.Jia Sixie's book includes advice on the following subjects except _____.
A.making wine B.keeping cows,sheep and fish
C.growing vegetables and trees D.making food
【答案】 D
6.The best harvest is reached when _____.
A.farmers change the crops in their fields
B.farmers plough the soil deeper
C.farmers sow seed at the correct time of the year
D.much fertilizer is put into the fields
【答案】 A
7.Passage 1 mainly tells us about _____.
A.farmers in China B.the development of agriculture in China
C.advanced technology in China D.genetically modified plants in China
【答案】 B
8.Passage 2 is mainly about _____.
A.farming in China B.gardening in China
C.the history of agriculture in China D.Jia Sixie and his Qi Min Yao Shu
【答案】 D
9.Which of the following is most probable in future agriculture according to Text 1?
A.Only high technology is used.
B.It will greatly harm the environment.
C.It will depend on only traditional methods.
D.It will depend on both high technology and traditional methods.
【答案】 D
10.From Text 2 we can see that _____.
A.traditional methods are still of great use B.traditional methods should be given up
C.traditional methods are of no use D.traditional methods are out of date
【答案】 A